Character Rotation turned a glyph's baseline shift and scaling with the glyph, and the Skew path effect slants a glyph's height away from the path's normal, so the x-height guide moved off the glyphs. Each positioned glyph now carries the transform that removes its Character Rotation (PositionedGlyph::unturned), and the guide goes through the glyph's x-height point placed without it, measured across the baseline. Snap to Glyph also takes Smart Guides being on in the tools, as View › Snap to Glyph already does in the engine.
- flow.rs: an opening bracket starting a wrapped line is set flush unless the paragraph is
right to left, as before the split (it had become !vertical, so vertical text with
LineEndHalf lost the flush and RTL paragraphs gained it). PlacementContext carries rtl.
- flow.rs, ruby.rs: put back the comments the split dropped (JLREQ, burasagari, Optical
Margin Alignment, kashidas, ruby phases).
- xtask root(): the parent directory, not .../xtask/..
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